Wikipedia: Transgender people have a gender identity or gender expression that differs from their assigned sex. Transgender people are sometimes called transsexual if they desire medical assistance to transition from one sex to another. Transgender is also an umbrella term: in addition to including people whose gender identity is the opposite of their assigned sex, it may include people who are not exclusively masculine or feminine. Other definitions of transgender also include people who belong to a third gender, or conceptualize transgender people as a third gender. Infrequently, the term transgender is defined very broadly to include cross-dressers, regardless of their gender identity.
History of transgender people in the United States - This article addresses the history of transgender people in the United States from prior to western contact until the present. Transgender people have been present in the land now known as the United States at least since the early 1600s.